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stepper acceleration question

Discussion in 'CNC Mills/Routers' started by Lybrary, Sep 5, 2022.

  1. Lybrary

    Lybrary New
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    In the profile files for the various machines provided I see acceleration numbers ranging from about 100 - 350 mm/s^2. I am a bit surprised at how high these are. I am using the BlackBox with Nema23 high torque steppers and I can't get to 50 mm/s^2 without stalling. I am running them at 30 mm/s^2. Just wondering what the difference could be. I do use ballscrews which require 400 steps/mm whereas the leadscrews of the various OB machines require 200 steps/mm. I think this explains part of the difference because in my case the steppers have to turn twice as fast to get to the same mm/s speed, but that is just a factor 2.
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    Heavy ballscrews are harder to spin up than our 8mm leadscrews. The lower pitch further adds to that
     
  3. Lybrary

    Lybrary New
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    That makes sense. Thanks for the explanation. Is there a way to change the microstepping to 1/4 or 1/2? In the docu I only see how to increase it to 1/16 and 1/32.
     
  4. Gary Caruso

    Gary Caruso OpenBuilds Volunteer
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    Did you try increasing your current as well?
    Gary
     
  5. Lybrary

    Lybrary New
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    Yes, I did. It did not make a big difference.
     

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